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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd43351425386123a09de72129e45020ee79e22405a2cba24932281581cf12416' 
  AND token = 'zQHbB96SIwYm09GAeEBSqUVRV/ZMymrE92k2psbP7BA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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