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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eb20060d023e8bd29ab07aef1deab0d96e2d4a51c599abe136cad61867be3560' 
  AND token = '8+Afv8dW6yY5BtTWhEMGTuNWlyIjMYEzMdVxT4ONn1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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