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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '181c2affb6d88d4b56a88d212874da1332b5f945acc7ef3da5204416dedffdd9' 
  AND token = 'u0E3VzlbycV20m6ENQ4pDcHSYKeZ4oQ6c7f3m6t50/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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