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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '72ab3ffbb087aaf6f0bafc421cefbaba11115b00a4c851d353711e8bcc2f1005' 
  AND token = '86lBi964fsO0ZJSPjqHlxlK8lb90TrvYW1g7Oqc9RA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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