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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c77f7ebc7e0be38bb7648b3e12965a5da09e677f83a4171abc265b876bd4b2c9' 
  AND token = '82M/3xNWmbEhs1IJRyDT8+HZ4bDQ+Ch2e5KHBio9O3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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