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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6df17ff4f173d21fa940cc889c068b2e39d43e039bba04fe7bafa9140e5004a0' 
  AND token = 'GfHJz3GDKEyt1lGfZcTgSGeBrYCFXIe1R/s1vttgzHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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