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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5fce3461cf8f212d2cc359f88da89141442b3efbba35b7866f089e39ff8ff404' 
  AND token = 'EhGscaKm3kTVr2TYHRybZcbQvk43j1ProMSHb64sJj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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