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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a89ce8c3dc1296bae308734a0b3937a89282c059cfac9acf28feafe4a7d48615' 
  AND token = 'LAJxMz67h199ZUTeSxxg+c2FFYQYwEzqttpWfSzPsUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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