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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '39bee4911d9b059e5225c4e7cf078747c481715c7bd6dd5fe12b0aa6a169730c' 
  AND token = 'rw9vqHIkIZaBj5Lf0kEX5acmoGH8IkjtvGEBFzRjyn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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