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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7ef9e7c96dc775be8d91d4185977172b2177ec9df3cedfa2366964de28326a54' 
  AND token = 'Mxj8QWWPNXr5e4eaLidW0+fK/twEEjGt9iX9HwC/jTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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