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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '31887a109f2358ae155a0027d248e18f0c056792a2475e8cbd9fc6dc346b030c' 
  AND token = 'ovszdtrOxoDqlmv9zhoo78kjI4pJTz8TcPWJWP5F59w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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