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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '69cded3eb77c8364e1805e2241d0e11e40d2a32f5ff4f3db25edc633d5e038e2' 
  AND token = 'rGdCrDK55N5D0ipvvATtKQRBOasOXt5vgqvFm/EB1fg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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