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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c78893879c6222c2f30d11ae9c7213bee6489d2d97d28ac87c2fd8fcb543848d' 
  AND token = '87ogw8Lni6MeyFuk/RU3mh8y04ISBtHxbkdpkwSdqYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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