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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f6e9341e5366f85629e33eb3b13eecff65e11abcc4872c7eaecd34bac81e07df' 
  AND token = 'FZdt9/8Ls4lO9lrzYbg358L1ZREqttqMpNb1aRtASs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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