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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e30e712ee23a5c4872ca640b49141ab0960c6d72acb2d245120d52d63fbe65b1' 
  AND token = 'cp0IORU38Xko4J0IBXEOTjaA/oz2BVehAHPEC0UQ7RA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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