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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '614dddafbf7f6aa1b091805df8da56c6f04930d2dc24a3ae1f244c546eca29a8' 
  AND token = '84h6dqXRWQfNFyfV1L/pxvc91uIjwbJBulB24a4YLX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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