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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '42521e97fda71785bef7ce33bab0d52e0a387bf8b10ad4cb9ea5caf508b5e3a1' 
  AND token = 'rdTSruur6fIHHiY544EjrG0SljaHSvH4o5jfqp73ev8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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