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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b8329890ce52346178158052d0f0ec103bef1939998a87191c9ec163fba6c714' 
  AND token = '4dE3V0vjV9xXHAo+v3WAxMl8DQ+02QiH2wRWfk1M5Z0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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