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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd13997aa2234da16669a9c2ca5d526a462c4c723a711a4e943421df41ef11cfb' 
  AND token = 'ZVfyumfPTxsQieM1i0jG/1pZ5vmSaRDNB17HkTlfWr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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