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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1b707d3801ffae2d472b7136478fd6a32b3ad437a9abbdca6ebe6a5971194268' 
  AND token = '/PzX46QWbcXjJiyJUdIs5QFeLhMY35PmmRXEETHHNvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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