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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'db632b3bdd7ff0165e583ca4af233a02cd1f1520a2ba9fbd9b9cc2d09e78a995' 
  AND token = 'bX7/u+37HDE5Sh6eFyLEudI9lQyGUu+EUTYGf2WHHQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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