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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b00221872c1afd50d41b3e21f82408ea826e520c500df213ae5c60f4db6c3a23' 
  AND token = 'Eok14cpE6D0fwJG0ZjE/9YjyViRYwlzGDaWh/PEbuI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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