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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '385fe01bc86a95653398e5ab400050e3ec8d55ad10be90deebf2f16138a34a7e' 
  AND token = 'h1CDrPkj+UK81jc9bbN+mcBfYn1/sJ3Kj/KRQOjQDac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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