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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1e2c52634fc5f9101049d7142bda65ec5bdf2eb7321aea8e2c4f8fe2ae4e2ca6' 
  AND token = '+9nPsmxowtCZc/cPAuI8k+au/oP6wJZmJFS9haVqy5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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