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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '543ec62c074c8beade44ac05282959081e0e810ad4e23bc32e5b058c1fba48e7' 
  AND token = 'oh3x+HDSBohPg2yqaKapZqyha/zVRJMBS8OWUG6b8/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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