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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ae2eae9fb13d4011a10b62205f3848ebb937ee228a9f99d00f3dffb93949cf4c' 
  AND token = 'ZSpzM6KoAqXlKpRnLbAhpeHqWMAgYDojPy8tb1P3hE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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