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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f9834e8d607f29d5876d2e192cbf1a04e5f481068f9dc34743d29294b4879623' 
  AND token = 'C4ezDc/UqtsPljSaIsM2Ri5/A4xIRStQzfDMRB2NfdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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