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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fd67499a9656c8db248c1b6683f304503cff5fc8df74e6ec450f96e23bae89a9' 
  AND token = 'gwet859tVR5JWt3JBeDr0wtFLuKqrqXrshbrhTNdmUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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