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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e7213074c8675c660556de76b84de2b4536ecbd838907c8ad07fd925ac4bc285' 
  AND token = 'MAiLBQbu5rJRruRkiDniru2md77iZnMuKqe/1693mtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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