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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4475e10fbaf1a90b2043834e6b74ff3e211a227d915c899bdc727ccd10390382' 
  AND token = 'p/Xda+vvyPfCZina7dGQIf1tdTQyaxizDRc+v4/uYh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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