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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8c5acfc124a6c00f78b0b785227f7feb051eafc64afdbadd129c89e532e2a136' 
  AND token = 'kXXizLR0ETe7QWFqWSeh45fPcaF3QMLSO1jSBIkNgug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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