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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd1189537cbd271660850987a7261c0c7c2565332d3dcbc2ca4022ab75436c5f3' 
  AND token = 'DUHl0ZKt+3PVs6MdtfM8UWjjgO4O3LQYaIEQM8qFRu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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