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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '87dd7744287f88926c369dedf9fb974e5177c30fefa5a9d1339bbb3d6179ad7f' 
  AND token = '5nLMhLwfAE+6NrsGeNvMJoigTAVryBaoAjaYTLNxEjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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