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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4e271f7c39fd140faf3398c231cf71cf1aa873ef1a08e147a6ecb64d46da5b96' 
  AND token = 'Dl66O2pUbdP/0bUoxXOEnkinkKfN2xNuhsdSqfG38+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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