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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f1239b32ebea47fa8545f58066ce28a59148ea653fe2b6222b00336fea3632d0' 
  AND token = '8s6IVp1t1vpd28MkQctlhkaJMj1y+Ga14ZKXYg8OqlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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