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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0083cc73a6b187202520f904ff2e61b644828d63ac4145c2581de2e53403e603' 
  AND token = 'XMaZobOdaYNi5TD3DujLzR7QE/WM7aRMUN1Sy/G8hiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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