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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '08c59c6f4d8248da5edf581f47e3da5e4fb16d5e7e853d77200843b351f29dbb' 
  AND token = 'khdwc/7Hb2HYquI8TM6jOB+HDzkj5suykxpbaElr+Xk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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