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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eae8f10f6da2ff726431eb4a14c502239376dd11687717f9e55677000d8fd253' 
  AND token = 'lfURu4cr5dWmiga1P5WSY0tcGLo4yVOQyKcykvEnaGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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