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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3c384a2e7c3ada528a6754d382f3457e7a78ca38b04908e749c1b4a6c31d043a' 
  AND token = 'afOX8qKiqtYEwNfKUz4Bv8LGSSXwAIIknmuw/MPMrFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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