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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6423174b7cf9b98f712223d3afdef6ebbb8121d786ddc840378c8a8b0b7d03ff' 
  AND token = '7qUY6cvEQoYL8HuR6Aa9ewDxPmFELSbJ81khwCtprrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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