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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2eda2790d29dde80597e1abad023feb7bc11bcd7091d8b3eff272a90af8b6887' 
  AND token = '/BXsVRJ6ehxS0jfQcZKn/cAN/hRVgiMsCzHiYF14em8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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