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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0638e5182c8fa9ac25ec81837472ad98274e7d0c08d5dca33643ae0c5b87f785' 
  AND token = 'iF3cJqvUAI/bqJ8rysXkpZtnGnpfL4IUbRpfGpSMGP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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