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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6799110e9a097044188b1fca719b74816a0b1e0300a583d1cb45e6e32bb8038c' 
  AND token = 'Fw5uOWqIMBzT/BuetC2baMLxX8cO9bC4r8ZMN6pxARk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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