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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2827c22a4aac14dd28112b829254b7755efaf5e794adc69449edf0b5a2718474' 
  AND token = 'Fu60yEi5ip59sJ+izSpKvMU5LmsqlCU3phk/lw9S4vw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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