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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5d72a7c47c3681c121c41f77174188ae20952faa0debb7450d3ac3f3559831b1' 
  AND token = 'ZjLeuJerEHlxcT8EoS1F2vnPguA5yycE8IHHmmoKmfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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