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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '202cbecf0ecc7162a6783b41ac42f035ef18cd0fd3b7e20f965fd3c9214e659a' 
  AND token = 'c50rEgpMHZv6QQ+0ZTiHMHprc+46l0AOn1gu6trxCek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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