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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6284bd7d29f2a9f959503a02d4b4f796bb799184c091a8f97bb2ed7295b5462f' 
  AND token = 'xxNuTPPWEpd86ybOWMYiV2J92XTfRR9njLBxT7bNk/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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