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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '42981696cd077d43efd05b04da370273da4bf22538225dc87ee2b7aef206d70b' 
  AND token = 'TOde9T+mHJea/Zbbs0UsWx2G4SoGR2b9lDehddnxRFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}