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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd009e4ada35c9ecd0fda3db948765a264c87561a39fe849f6bde8df9847560da' 
  AND token = 'CPtonjJae5jS0qTaZucn71uzoQQPZ+YCWfLfGtlmE6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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