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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fd3855b422a11b28b1d7ad64fb1375970d194e048652d477a577b399d316c769' 
  AND token = 'W9+0zgiRAJSaqD6C364vzmZWiI6ziX9uhHaNK0b9IEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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