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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2df3128c67c351aa5732921fab65248d21d3d73c0793313d0c9c4c5b73aa7a38' 
  AND token = 'ChGAVIKbiagqiSjUEHWTtAOXk4G++DAP785pot5ce9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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