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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5551306f5e713aaadd6f4c3e061040b08e944736d312071877d6d35c0ea7dd8c' 
  AND token = 'G3K9hRJfhn3DBsj9ThAlPtxtfmcuZIjQCQr6f9ktdF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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