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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'be4e38162d28e4933d0973aed6145472e3d32a25ce019f001c4e5a795ed2ec38' 
  AND token = '3bmJ7puaGuwhFBXJmOBmGcch8Gu0ObCji5cdgfrNdW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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