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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '85fc8bfb2b2b84b6f333a8f89d81abef76375702c5de90ad39e8641552810a21' 
  AND token = '70HR+Xx6ZjMfynNpaCfU+5+jLiXAWcJspMUu6s1LPFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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