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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6d4d0b671f47ef500a692f5e452fe36bc366493cc427d11c7d71acd3207674b6' 
  AND token = 'NYvzfI7GElboKf72IWnW2MFN0E1cRc9ppxPUScBYd6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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