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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '73e6f279bb0dc69540da89798c4de23fc2ab0affdf3d023203fa13d0070d933e' 
  AND token = '1grZt1OKk9oYIjHgHpRwz7OwXrf/2aGWyqyL1LtfpV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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