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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1ecfa6d8a868ca56a4fc247e5005db0117803160faaaab73e9deda2a44f9e6f5' 
  AND token = 'seBGtc5zILFb6xsHEkFbGNz6Rx7LkDEx5ZloHXK77S4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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