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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e0dacb1140078ea2b74fb0611e76d9d36bd3d2877cefb8ff478422ee3f1de0cf' 
  AND token = 'rsew5esTcHolcXEQl9JheAc2DZSILeATmKTRlLFx+Gs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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