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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c9dc109799b6e6a5b574d1b6423c3edd5216d6423b4e49e2a108baf87fcf9fde' 
  AND token = 'fKGoDQ4wVbmxUxl2naTqXbgtjT3/ScB7ERg5B66ditc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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