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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '71aeeb35361a33166d8c31831a306813bf4f2f9329964da9f8e7d466b324db9c' 
  AND token = 'UKsoguDoBmbdYfIMOb2bIuosddmWDH/cY5JOkiU6RRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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