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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ffe08407bb242cf249a636749acf64c483a309364f667cc4c5c951a914bd8e1f' 
  AND token = '86fhXvmz1GOgnP+en6EJXGoD3inXF43g5DuQX6HDt/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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